In a classroom, 4 friends are seated at ...

In a classroom, 4 friends are seated at the points A, B, C and D as shown in fig. Champa and Chameli walk into the class and after observing for a few minutes Champa asks Chameli, “Don’t you think ABCD is a square” ? Chameli disagrees. Using distance formula, find which of them is correct, and why ?
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